JPS61271027A - Oil-in-water powder dispersing and emulsifying composition - Google Patents

Abstract

PURPOSE:To enhance the stability to skin and reservation stability of the title composition by incorporating higher alkyl sulfonate, higher alkyl sulfuric ester, N-long-chain acylglutamic acid, metallic oxide powder, oily substances and water into the composition. CONSTITUTION:A weakly acidic oil-in-water powder dispersing and emulsifying composition is prepared by incorporating at least one anionic surfactant selected from a group of higher alkyl sulfonate, higher alkyl sulfuric ester and higher alkyl phosphoric ester, N-lon-chain acylglutamic acid, metallic oxide powder, oily substances and water into the composition as the essential components. About 0.3-3.0wt%, preferably 0.5-2.5wt%, anionic surfactant is incorporated. N-lauroyl L-glutamic acid, etc., is exemplified as the N-long-chain acylglutamic acid and 0.3-10wt%, preferably 0.5-3.0wt%, acid is incorporated.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to at least one compound selected from the group consisting of higher alkyl sulfonates, higher alkyl sulfate salts, and higher alkyl phosphate salts, and N-long chain with acylglutamic acid.

(Prior Art) Conventionally, ointment bases or emulsified makeup cosmetics, etc., which are oil-in-water powder dispersion emulsion compositions, have been made using higher fatty acid salts,
Emulsifying compositions containing anionic surfactants such as higher alkyl sulfates as emulsifying and dispersing agents for metal oxide powders are known.

However, the essential requirements for ointment bases or emulsified makeup cosmetics are: - No skin irritation and high skin safety. ■Excellent dispersion and emulsification and good storage stability. ■
Must be water resistant when applied to the skin. ■Excellent sensory properties during use.

It is also important that the emulsified composition satisfies all of the above requirements, and that the liquid property of the emulsified composition has a pH of 4 to 4, which is said to be preferable from the viewpoint of skin physiology.
It was also not easy to obtain a compound showing the weak acidity of No. 6.

That is, when blending stearic acid sodium salt, valmitic acid triethanolamine salt, hexadecyl sulfate sodium salt, dodecyl sulfate potassium salt, etc. as an emulsifying dispersant for metal oxide powder, it is necessary to maintain the desired storage stability of the composition. In order to be satisfied, the amount of these anionic surfactants must be increased, resulting in poor skin safety of the composition and cannot be expected to have water resistance when applied to the skin. Furthermore, even if metal oxide powder whose surface has been coated with hydrophobic silicone, calcium salts of higher fatty acids, aluminum salts, etc. is used, it becomes difficult to disperse and emulsify the hydrophobic powder. However, a composition that simultaneously satisfies the desired storage stability and skin safety was not obtained.

(Disclosure of the Invention) As a result of intensive research in view of the above-mentioned current situation, the present inventors have found that the specific oil-in-water powder dispersion emulsion composition of the present invention, which will be described later, sufficiently satisfies the above-mentioned essential requirements, and that The present invention was completed by discovering that the liquid exhibits weak acidity.

(Objective of the Invention) An object of the present invention is to provide an oil-in-water powder dispersion emulsion composition that is weakly acidic and has excellent skin safety, storage stability, water resistance, and sensory characteristics during use.

(Structure of the Invention) The present invention provides a weakly acidic acid salt containing a higher alkyl sulfonate, at least one higher alkyl sulfonate, an N-long chain acylglutamic acid, a metal oxide powder, an oily substance, and water as essential components. This is an oil-in-water powder dispersion emulsion composition.

(Specific description of the structure) The higher alkyl sulfonate, higher alkyl sulfate salt, and higher alkyl phosphate salt according to the present invention are:
These are known compounds, and the higher alkyl groups constituting these compounds are composed of saturated or unsaturated hydrocarbons having 12 to 22 carbon atoms, and their salts include potassium salts, sodium salts, jetanol, etc. These include amine salts, triethanolamine salts, L-lysine salts, L-arginine salts, and L-ornithine salts.

In the present invention, it is sufficient to apply at least one compound selected from the group of the above-mentioned anionic surfactants. It has the function of dispersing and emulsifying long chain acyl glutamic acid in water and coating the surface of metal oxide powder with N-long chain acyl glutamic acid. For the treatment, higher alkyl sulfonates are preferred, such as dodecyl sulfonic acid sodium salt, tetradecyl sulfonic acid potassium salt, hexadecyl sulfonic acid lysine salt, octadecyl sulfonic acid triethanolate salt, etc. . In addition, the blending amount of the anionic surfactant of the present invention is 0.3 to 3.0% by weight (hereinafter referred to as w) based on the total amount of the oil-in-water powder dispersion emulsion composition.
(abbreviated as t%) is preferably 0.5 to 2.5 wt%.

Q: If it is less than 1 wt%, it is difficult to obtain a stable emulsified composition with good dispersibility, and if it exceeds i o wt 96, the composition will not have a favorable appearance, skin safety, and feel when used.

The N-long chain acylglutamic acid used in the present invention is obtained by adding a strong acid such as hydrochloric acid or sulfuric acid to an aqueous solution of a known N-long chain acylglutamic acid salt, and separating and purifying the N-long chain acylglutamic acid released. For example, N-lauroyl L-glutamic acid, N-myristoyl L-glutamic acid, N-stearyl L-glutamic acid, N-oleoyl L-glutamic acid, N-araquinoyl DL-glutamic acid, N-behenoyl L-glutamic acid, -Gluta↓ One or more types of L-form or 9-form glutamine derivatives of an N-long chain acyl group having 12 to 22 carbon atoms such as mic acid are applied.

These N-long chain acylglutamic acids are adsorbed or sorbed onto the surface of the metal oxide powder dispersed in water, and by coating the powder surface uniformly, the powder surface becomes lipophilic, and therefore the powder has good water resistance. is obtained, and the dispersion and emulsion stability of the powder is improved as described below.

Furthermore, in the present invention, since the metal oxide powder is subjected to a lipophilic treatment during the manufacturing process, there is no need to use powder that has been previously subjected to a lipophilic treatment, and a composition that is inexpensive in terms of raw material costs can be manufactured. I can do it.

The blending amount of N-long chain acylglutamic acid is 0.3 to 1Qwt% based on the total amount of the oil-in-water powder dispersion emulsion composition.
, preferably 0.5 to 3.9 wt%. 0°396
If it is less than 96, it will be difficult to obtain an excellent water-resistant powder and dispersed emulsified composition, and if l Q wt is 96 or more, it will be difficult to obtain a powdered dispersed emulsified composition that has excellent appearance and feel in use.

The metal oxide powder according to the present invention is one commonly used in cosmetics, such as red iron oxide, yellow iron oxide, black iron oxide, titanium oxide, zinc oxide, cobalt oxide, barium oxide, etc. It is a fine powder. One or more of the above-mentioned metal oxide powders are applied to the powder dispersion emulsion composition of the present invention, and the blending amount thereof is 0.5 to 20 Wt 96 based on the total amount of the composition. is suitable.

Further, examples of the oily substance according to the present invention include higher aliphatic hydrocarbons, animal oils, vegetable oils, waxes, higher alcohols, synthetic ester oils, silicone oils, and the like. Examples of higher aliphatic hydrocarbons include:
Liquid paraffin, squalane, petrolatum, ceresin, etc.
Examples of vegetable oils include olive oil, castor oil,
Examples of animal oils III such as cacao butter and palm oil include turdle oil, mink oil, parsein oil, and beef tallow; examples of waxes include beeswax and carnabarok; and examples of higher alcohols include lauryl alcohol, Examples of synthetic ester oils such as stearyl alcohol, cetyl alcohol, and oleyl alcohol include straight chain esters and branched chain esters such as butyl stearate, hexyl laurate, octyldodecyl myristate, diisopropyl adipate, and diisopropyl sebacate. I can do it.

The blending amount of the above-mentioned oily substance is preferably 5 to 60 wt% based on the total weight of the composition.

The amount of water added is 30% based on the total amount of the composition.
~9Qwt96 is suitable.

As is clear from the above composition, the composition of the present invention exhibits weak acidity, but pH = 4, which is considered preferable from the viewpoint of skin physiology.
In order to adjust the acidity to a weakly acidic range of 6 to 6, commonly used inorganic acids or organic acids may be added. Examples of inorganic acids include hydrochloric acid and sodium dihydrogen phosphate, and examples of organic acids include lactic acid, citric acid, and tartaric acid.

Furthermore, if necessary, other surfactants, emulsifying aids, pigments, water-soluble polymer compound fragrances, preservatives, ultraviolet absorbers, etc. can be appropriately blended within the range that achieves the object of the present invention.

The oil-in-water powder dispersion emulsion composition of the present invention can be applied to ointment bases or emulsified makeup cosmetics such as liquid (emulsion-like) foundation runes and cream foundation packs.

The present invention will be explained below with reference to Examples.

■Human skin patch test, ■Storage stability test, ■Water resistance test, and ■Sensory test described in Examples were conducted as follows.

■ Human skin patch test Sample 0.05-f was applied to the skin of the flexor side of the forearm of 30 test subjects using a batch test adhesive plaster with a circular lint cloth of diameter 1.03 for 24 hours. The skin condition of 30 subjects was evaluated for each sample according to the criteria shown in Table 1. The evaluation results were based on the strongest reaction between 1 hour and 24 hours after the removal of the bandage, and were determined by the number of people who rated (excellent) or higher.

Table 1 ■ Storage stability test A sample placed in a 100 txl graduated cylinder made of transparent glass was stored in a constant temperature bath at 40°C, and after being left for 3 months, the dispersion state and appearance of the powder were observed, and no abnormalities were observed. If no difference is observed (powder forms a uniform and homogeneous dispersion state), it is considered good; if an abnormality is observed (powder sedimentation at the bottom of the graduated cylinder, powder aggregates, etc.) ) were considered defective.

■ Water resistance test samples were uniformly applied to the forearms of 10 subjects for 9 d at a rate of 2'q per ld, and the test samples were applied indoors (temperature 20°C, humidity 65%).
rH) for 30 minutes, then immerse the application site in a bath of water at 37°C and leave it for 3 minutes.

After lifting the coated part, the coated part is thoroughly washed with acetone, and the amount of titanium dioxide in the acetone cleaning solution is determined by atomic absorption spectrometry.

The average value of the above powder residual rate of 10 people was calculated, and the water resistance was evaluated based on that value.

■ Sensory test (appearance and feel during use) test subject 2
The sample was applied to the forearm of 0 people, and the external appearance of the sample, the application state of the sample, and the sensation of θ stimulation were evaluated.

The evaluation results show that the sample is separated in the external appearance of ■.
Alternatively, it shows the total number of people who judged that uneven coloring occurred, and in the @ application state, it shows the number of people who judged that uneven coloring occurred when the sample was applied to the skin. The number of people who complained of irritation after applying the product to their skin.

Examples 1 to 4 Comparative Examples 1 to 5 [Liquid foundation] In the following composition, the types and amounts of anionic surfactant and N-acylglutamic acid were changed as shown in the left column of Table 2. 1) Composition (2) Manufacturing method (6) After heating and dissolving or dispersing the ingredients at a temperature of 80°C, Add component (O) to the mixture, perform high-speed homomixer treatment to disperse it uniformly, and maintain the temperature at 8()'C.Next, add component (2), which was previously heated and dissolved at a temperature of 80°C, with stirring, and mix thoroughly. After performing high-speed homomixer treatment, the temperature is cooled to 30° C. while stirring.

(3) Characteristics The various tests described above were conducted on the samples of each example and comparative example, and the results are listed in the right column of Table 2.

As shown in Table 2, although the compositions of Comparative Examples 1 to 5 containing only conventional anionic surfactants have good storage stability, they have poor skin safety, water resistance, and sensory properties. It was clear that good results could not be obtained. Examples 1 to 4 of the present invention are compositions in which equimolar amounts of an anionic surfactant and equimolar amounts of N-stearoyl L-glutamic acid were blended, and the compositions performed well in all of the various tests. Examples 5 to 8 Comparative Example 6 [Cream Foundation] Similar to Example 1, cream foundations of Examples and Comparative Examples were subjected to WaS and various tests were conducted with the following compositions. The results are listed in Table 3.

As shown in Table 3, when the blending amount of Comparative Example 6ON-long chain acylglutamic acid was less than 0.3Wt96, good storage stability could not be obtained and water resistance also showed low values. In Example 7, the amount of anionic surfactant blended was small and there was no problem in practical use, but color unevenness was observed in the coating state. Examples 5.6 and 9 to 11 [Ointment base] In the same manner as in Example 1, ointment bases were prepared with the following compositions and various tests were conducted. The results are listed in Table 3.

(1) Composition As shown in Table 3, the ointment bases of the present invention of Examples 9 to 11 were found to give good results in all of the various tests.

(Effects of the Invention) As described above, the oil-in-water powder dispersion emulsion composition of the present invention is made weakly acidic and has excellent skin safety, storage stability, water resistance, and sensory properties during use. It is clear that the present invention provides useful ointment bases and emulsified makeup cosmetics having the following characteristics.

Claims (1)

[Claims] At least one compound selected from the group consisting of higher alkyl sulfonates, higher alkyl sulfate salts, and higher alkyl phosphate salts, N-long chain acyl glutamic acid, metal oxide powder, oily substance, and water. A weakly acidic oil-in-water powder dispersion emulsion composition comprising as essential ingredients.